hw/xwin clipboard updates

Jon Turney requested to merge jturney/xserver:clipboard into master
  • Implement INCR protocol for X clipboard -> Windows clipboard transfers
  • Remove support for pre-Vista Win32 clipboard API
  • xcbify clipboard integration

This removes the final use of libX11 in hw/xwin helper clients (which avoids all the issues with client code using types with sizes depending on _XSERVER64)

Edited by Jon Turney

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